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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d3f8849681851f3891e72392337a89638e94afe1f4c12d52e27f131743ef8a' 
  AND token = 'hX5fYuQytMNYySX0rg1Z1A+BeCfbDzhGd3WGv4Ewm0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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