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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125439f8f7a60d8b5c96b31441b941233623c6feee7acba5940aec11f7532cc7' 
  AND token = 'plLeYH54ZbmHPR108OL6A5XPIIJxzZ9NHjm9l+U49jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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