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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc54110ab9ee6b380d2618dc6bc7887e08588f7b2e51239344bd4547524161b5' 
  AND token = '4CxAvdiN6bgKjD4vnAeQCuvNfAVhcN1B9AtxdJ3w2dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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