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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73adb1e65aa659646547a785afeca5875d1f0e73bdee3eeac4fd75c98e6c4b14' 
  AND token = 'SFPwqG7fovW0A6K7EmEXSbQySLxtI5z2SGAp0VFpdeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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