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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f813bccf70bf26deb39d8f8d3d3344353eff2e851a3f5bbb11cdfd5244c5267' 
  AND token = '7FDrPPnMRqrqB4QviK39ms4wl0WJiod0LC2zsXg3oUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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