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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a215a3c494c9f2972a0e9a98d7e05099ccbd896ffacf5f00c1f45ca12532eb56' 
  AND token = 'So6bXGJtDDEY/rKlIiTwa+ABoFQ3HoYjMdJxGZ/q9nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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