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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fed1c03d9d896b8ed1a67e6e33e9cb5df9c2d5338f0c491b35c6244f2116c40' 
  AND token = 'rT70dq4UgQD1g5UfHYmTtPt9owD0DAXU+u7dnOk4cmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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