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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f305de2f0910f8fdca9cf3885197429a3192c51f06f5ccb6e4cd36e0bd17681' 
  AND token = '6yqEa+8Y9eompEg4snA6aDolmaZ09MNXyRVDWXUWgXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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