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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11062ff3468f5663e2d81fcea13d7d852ccbae1684cb11e982bc63bdd6e3943' 
  AND token = 'Gs3B3Ipj8zQ0mIsiuTSH0nwHr66dqYo0GDG9BNSkGpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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