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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47d41de83bf24d18bcee6e744e25f1384e603e3956ea31d0e0689e692390d3d' 
  AND token = '2WGKv1Dh/rzw8E0RW5tq5D8BuQRpOARK7hG0tmdpRag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}