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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a150d01b1343da3b5e73adc9195c1c18ee83951fc78cf8e54ed92a979bb775b6' 
  AND token = 'p4NO1dwi+J8E+/OqRSIrc470Ucn69+wq1sEBiOVrYGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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