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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0d0bc0924ccb48bee0c39ca2b6a49141e6317fc91d0d23e0e28db6898768e3' 
  AND token = '0/gCGy0329vHf7a/tSJoEbT+Z6N8aZVmvm+9tp/f4iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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