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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf453ed6cdee593bf363ed1ebd16722f7675c5cacc9a150eca47762e36430a2' 
  AND token = 'WxDRqCXq0Jf76tm/ikYFFpSFSk9CLhXE5bHwzutcPUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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