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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8049a08c4a790a724169b4111a336e1e497ce55ace77b8a819982d26bfab168d' 
  AND token = 'jDhcXmUUz4oaLh2GtoGS+rtbqzHMRzJJg5MHp0LYPC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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