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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875abea48c1a303faedd4f50fd16f821d3ac44d237dec73da663a793e0d67fb5' 
  AND token = '7RTfsBRh/h077nKOF04HXxeVKo7dmnvd3lNWgQF/8s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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