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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe6c7aa61f4138c6c0b225d6aa432bf93decebffcc475aaa350a285bec8fa06' 
  AND token = '3KhWekYrtM78WfnO9co2CnMwyb4qPFQ0Vr6u6j853CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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