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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67936dd955ab4ebe0283ebf28b6338f37c283d2e998c06595f06f074a9105330' 
  AND token = '1UaT9hqZ1R9I7lvWPE61LfX3aGdcBRq5fZ9107GZLjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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