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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fae50ad5452ad114470fa14293f0b9020140eda40d3e4047caa7794fa87626c' 
  AND token = 'cv059EMBg056z9mphPvfunK5M1sfq7KoOZ0KVzCmoP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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