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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c236e288085c35f4ba1a7264d1c90b09a8d6a569ef30573308d6b9454e6da133' 
  AND token = 'vBT1qNfago/6N1SrC0W7S/sW53oFjTemsf7bbtJ4EtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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