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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83940128d2657e00f442964db9ca83b7c599c88302a9a91147eed8c7909fe63' 
  AND token = 's6iGNZDPeSmCIUDqIr0S6xr1tNQq+4Sl2VY8k6hj3ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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