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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1794011a5c29ae0ba4731f8a1b73d356c62dc79c0a5dd251a72f92a6a5776c' 
  AND token = 'q4l/+q7P7pMCPcCvvrWdHcvLpXKfWlu5AjDfxuWBSjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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