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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564171362d5f8bbc5818636da5da181009de03a04bc405876ea2d9e7efd8ca1e' 
  AND token = '+xYbu3TEEiHDCC4pYfbAWgdFSuZBoofEaljINcffhPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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