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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c738d8ac8cca968e9c1372b479752b3f97447042f5e2550d9a7741648d3c0f' 
  AND token = '1Z4O55S6Y5Wrkvo5by5i76ZVi9plphPCnwSsz9+/toQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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