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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b849e7767d1130a4cb3efe95a590e1d1b9222f001bb59be06a856f18d9c87' 
  AND token = 'v46dyA8vmyMCkjmmvE2bXjblP1uj/1yvZGz6DtNSaUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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