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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef327a896979f7cc130a3f0a78302f09e7d1b6a9e3ffb3ac938bb066c8a5b142' 
  AND token = 'jbBMswLhv7UfhnUvEytX38YSpqt1krFt/869ghuFd/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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