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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e2efaba9ac185db1e1e6bc96a5f589ece602021f5b852ea6ae4d4ece40bfdd' 
  AND token = '5aJXfuckLtvt7b45VmAH0P+4+2lbWP0yIYGO23aAZNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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