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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dcab1523d4eb69b0c431e3e5ee4760232979ee81beddf2e606f0a062dd7581' 
  AND token = 'sEo9IXWzA/c99ff5VcPXJFsKR4RsWUZBunQYHkvd7GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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