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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d3f026a5a2ac88fe796a880b42ed60ebe6e8aea6d023da5d436c6595ff5f47' 
  AND token = 'MIMcqfkOQQrqNWabGBp6HiDsoEgEdWV0z8DFj0QLduU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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