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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83e46e03bd5d3c8e6d47b2fcdc47ee9c118a3f04fd8b7c33b59ed2d58621071' 
  AND token = 'us/IciWmerst5Z5ALPkjBUoqyzTyuxK/GCKf3Q5sUcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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