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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fdbb5cf901b98e031b73c0f171ece6760d4aa0b6a6f47e7a70b27551db4759' 
  AND token = '+Z+WGHJiELQPk6ADpvvNN7Z3d1KeVXn6gzTOtPBsRDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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