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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4842a743185a5ee0cfe6fb2da0b5a0c382c769550c242559fa19f46b81e7cc76' 
  AND token = 'a0ftb2xAMO74lPXIrqRXX0A6ytLsAQ6+ZeSO2cwp5tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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