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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdd49e976ba816bf230a3feb541af6e09974cd1c8548d7e52d168e8e1bf7bc0' 
  AND token = 'yCeY2xkM21cu3C4oD6ql8LAve1c9IgrVZglipyTZZ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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