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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a6f7d4008dbe0fc60e1e2123c55d6ad0a119eab8b6680be3bbb431258fb9e1' 
  AND token = '70hCkmTPqoD/2HZm998jt7jDfddJGyUPZonbkrzflpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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