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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0266bb6dc3a0f509df333bbd9de605b7395a3ac3bc641be2def084c6aaf3129' 
  AND token = '3spCJsk6Bm/5ROwWq0JudxYVEe4Orm2fnyOfGya7IEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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