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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b997941c01e093d88355bc85d1f4340495f52d5c6bb3aacc75fed6d6d96b006f' 
  AND token = 'woMdbg4CmlwkRBab6hFQxJmz4hZNqfkBhz2HJt4iap8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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