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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa698a915dc14c438b7418b8dd2bb919ee7311ac6ec5e6a664f04a8b8a1dbb4' 
  AND token = 'Ing4atfFK/X8HxE/+dtPRfKzLI4v+nzqw+KJWYPfKhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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