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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2fca78f6b7958b1de5f714c7732d31f6ed222ad5f6de03008f7f77e937f2b6' 
  AND token = 'OW9rZPdm+ePpZEhoyyq+B8RfDPt+2WSfaH9EbwMul+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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