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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9ec390f55737123285f8d0f512798fbdea8a038746d78a3c8de9224b56e0bd' 
  AND token = 'OayP+L0l3FAJyu/MyiwrI8+LhZ4up1GTniieyKgh+qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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