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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a16c645a2e129b83025162920214bcc10e6ae4b06330609ac01bdfe1c5fff68' 
  AND token = '+w8RuD4+eK98UMbJL6RMc98PxvGXlTdThZ8fe3lr2IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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