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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16905bcaa764ebbb005633bd27f1c6a79a63f7d84867e28c076c7fc038144489' 
  AND token = 'JuBh63nzw91hhnuTAoo5ZmCV6R9L4DUOBt6ueLipKyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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