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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489c515401a8cb9a34a26047f7571d12f4ce1f54a0a9f8c5ac998e9cbf782c2a' 
  AND token = 'NNhP+/cxVfoAl+Xeog95SYucUy6v0zgtXFqgl/c/mj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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