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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096c8a42f62869aa6d1a689d1a8d57765dec696e611d280806fe19c68fa23239' 
  AND token = '3yxsFAG2uAeozfJNoJZUefGFMyp3qrx+tbGAiBJ0CR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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