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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c737c79fa89265ea017d79784978b981186a9e877cf225d319a7bf836feeee' 
  AND token = 'h1oqnAkRhAz1B4eW9vUbDL7tmvPudJqifOtYqOnZoTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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