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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ef5d2aec3b1c6e832ce11f93572b6202aa459f561656d9978b4e367ea53490' 
  AND token = 'lTVv2a2rsmms7MBHw1iPpiSLE8aT32IPbT/O+Mop/jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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