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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d85d546e1e9f1b2d27de38c71784330a490c4dc3c98873ea5ac503251fb0c6a' 
  AND token = 'm+OHJIu0GyjZpx/8f7NMGLCbw266/zk15c7oEhy9PA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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