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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4a6d1838ed3dca6cd1abc6586c861829d3b379ba6204e0b7ee5defbd9bed48' 
  AND token = 'KHzgnTn+hp882YFiKMUfcyvrmKOGkWtSQZKCfht92Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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