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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fe27d0b9ca73c239f9fe6fb830caffd25e10ed02c1dd6367f0fc15ee7907d0' 
  AND token = 'dBJC3RrY04Mrvsnpfy2C9Smaj6aY7vhiBeHkoamrpHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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