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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4d9bb88cbc39e16a69d8d8d1c4e05dc5a746f5cf5d90b2b2cd666b0b307032' 
  AND token = 'h/93kPPwhGO1Hl0AMFoOmKrnf4fYgPM6Z7rUF1QZ8xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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