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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4be3898ea684b11b95909099687768899f422a6aaa40e045616fd862d6759e' 
  AND token = 'KfYF3tjn/iINGXfaHk7gqIm2kbzmdgnC6QtHOGK6dRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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