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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53309da85415574f75d24787f1bd5b09e4e1bc9ede7a176a08f6c48fcb12cfa' 
  AND token = '8RaPyPnplAZlcnda5mukyKKzm1DRq+pL794fB3+qXGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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