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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc301eb68801387c06f3a18c4de51a73eee4c354bb06cc96b030a182cba32894' 
  AND token = 'N8Y73zYEtU3NEYv9VfRaUxHBONvs+mh2CL/0o3qHZ+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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