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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c2a38f80e90c9bbb401f329052577bb38b69762d69c83d6eb0924a1fe16d6f' 
  AND token = 'OJVzUO+QePfTpezdniRjsaxIFWAKZjU8afLJR71L6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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