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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edff4ade450e1178c8912cab8459e39e089bb2c9d04ba7c4a6c7a3f5a0b39f60' 
  AND token = 'TVMZ6gjs3rRIIMGokxPfvHFfv762McC6m43rHc4B/SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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