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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fe2d69f75de85e17ee9830f4a172d7dad5430782b2f2ea46319dabb9755f44' 
  AND token = 'ld8DtW0vlSF2dGscX+1PhdkfFcFkZpA/tlmSOs+eJPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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