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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda536dab33093f9419373c2b576a42a680e9b0a0fa3b6d8ab62e46ec3b7fdad' 
  AND token = 'JII573LjIHdTq8MZiz6RT6EA7/Ix0IbEHQccqwedkfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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