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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e07be2af5b007238fa4f1c0f4c4101d8089bdec1a0e305358e9fa39be7936' 
  AND token = 'owqc8o1g5fCKexDaO2ZtpJ+GHEjSWS9CEBT1hba4m84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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