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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c904cfc7a8fc75dc59712dd70e2b8019831c44b341fb132e631ec58796faae' 
  AND token = 'v1fym4KY2+3FH0Eznf21fzexui+DGyS5M5aK4zqiX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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