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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fda7098fa2a07766d3021fbb190668c8faadc79f478666cfa093bd913190682' 
  AND token = 'wlObo3R6jy8hWnRx801DIR8Hv3/zIzyANIKgv9UQDgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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