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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee3868258c49a3561ada25c98dd1dd5456e29294c74976c9e2590c55e89f6c0' 
  AND token = 'V1bzUyCRXqpTPriOVzFSDJ6Iaqr0LFmQ91/B+WrGW9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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