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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f84276ad6e617e1d59c1e8d99442ecc21343be1a986bfa10eda46904bd2eba' 
  AND token = 'QHD9C2a/l+I1F5jQJ9Gxiroh9rxFHQTDnbpb1Lz8hOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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