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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bed032ad1eb3988410066fbd4ccdb6d248082bbaac3c5887a509971e6dedd10' 
  AND token = 'tYwul0ceFs+n0n0EY76Nlc91jeZUMffdGWjfeEN8Dk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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