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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee58b689c48bc8cadf3b77b64437cda6a85cd891a99c1fcf7b5075c336b5227' 
  AND token = 'DSGL1Xex1B+oztjQ6yU8YFNlWIwC9x81VoOvoE3WyUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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