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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6067313b28a63f1a81f5ebf94c8a0a1b7552d6bf12f324581d05994310718db5' 
  AND token = 'OcbCfEEfK6IKobYTrbArXCFAJlFk+qA//xRMXfcE/8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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