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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffde6e79040fd1c69b9f6818bdb8a5d938cb2829e1d5da3d0d4f015d3abd1495' 
  AND token = 'jI4AbLoiI63uPh1urWIS+0Wu+C8TLnxCiPzA6GcrO58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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