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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b252d7135e713e4bf541976ee24e107fc4686fc691ca2d29a6fcb30e426fbcf8' 
  AND token = 'HFPvHvw+UmK46bd4I0p+t3ER7lh2FI9epyh17dohHy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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