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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb13e0da361f89fe01a99cdabac9027d8f403bea81534936b98717168dca6f98' 
  AND token = 'xu1ieQhevZoSCbxjV4br0sfBlq0WMNpMzbetiWuXmHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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